Finding the Fourth Proportional to 287,662.58, 431,493.49 and 77,300.53

Step by Step Solution

1. Step 1: Write the proportion equation
   287,662.58 : 431,493.49 = 77,300.53 : x
2. Step 2: Convert to fraction form
   287,662.58/431,493.49 = 77,300.53/x
3. Step 3: Cross multiply
   287,662.58x = 431,493.49 × 77,300.53
4. Step 4: Simplify right side
   287,662.58x = 33,354,675,468.55
5. Step 5: Solve for x
   x = 33,354,675,468.55/287,662.58
6. Step 6: Final answer
   x = 115,950.69