Finding the Fourth Proportional to 919,233.89, 1,378,851.23 and 288,196.91

Step by Step Solution

1. Step 1: Write the proportion equation
   919,233.89 : 1,378,851.23 = 288,196.91 : x
2. Step 2: Convert to fraction form
   919,233.89/1,378,851.23 = 288,196.91/x
3. Step 3: Cross multiply
   919,233.89x = 1,378,851.23 × 288,196.91
4. Step 4: Simplify right side
   919,233.89x = 397,380,657,661.94
5. Step 5: Solve for x
   x = 397,380,657,661.94/919,233.89
6. Step 6: Final answer
   x = 432,295.48