Finding the Fourth Proportional to 278,931,243.15, 384,913,556.69 and 151,772,446.50

Step by Step Solution

1. Step 1: Write the proportion equation
   278,931,243.15 : 384,913,556.69 = 151,772,446.50 : x
2. Step 2: Convert to fraction form
   278,931,243.15/384,913,556.69 = 151,772,446.50/x
3. Step 3: Cross multiply
   278,931,243.15x = 384,913,556.69 × 151,772,446.50
4. Step 4: Simplify right side
   278,931,243.15x = 58,419,272,187,655,456
5. Step 5: Solve for x
   x = 58,419,272,187,655,456/278,931,243.15
6. Step 6: Final answer
   x = 209,439,686.74