Finding the Fourth Proportional to 388,147,142.12, 582,402,526.72 and 191,303,248.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,147,142.12 : 582,402,526.72 = 191,303,248.50 : x
2. Step 2: Convert to fraction form
   388,147,142.12/582,402,526.72 = 191,303,248.50/x
3. Step 3: Cross multiply
   388,147,142.12x = 582,402,526.72 × 191,303,248.50
4. Step 4: Simplify right side
   388,147,142.12x = 111,415,495,295,665,792
5. Step 5: Solve for x
   x = 111,415,495,295,665,792/388,147,142.12
6. Step 6: Final answer
   x = 287,044,481.86