Finding the Fourth Proportional to 287,435.78, 431,151.34 and 74,185.46

Step by Step Solution

1. Step 1: Write the proportion equation
   287,435.78 : 431,151.34 = 74,185.46 : x
2. Step 2: Convert to fraction form
   287,435.78/431,151.34 = 74,185.46/x
3. Step 3: Cross multiply
   287,435.78x = 431,151.34 × 74,185.46
4. Step 4: Simplify right side
   287,435.78x = 31,985,160,487.52
5. Step 5: Solve for x
   x = 31,985,160,487.52/287,435.78
6. Step 6: Final answer
   x = 111,277.59