Finding the Fourth Proportional to 287,117.55, 430,643.49 and 76,771.89

Step by Step Solution

1. Step 1: Write the proportion equation
   287,117.55 : 430,643.49 = 76,771.89 : x
2. Step 2: Convert to fraction form
   287,117.55/430,643.49 = 76,771.89/x
3. Step 3: Cross multiply
   287,117.55x = 430,643.49 × 76,771.89
4. Step 4: Simplify right side
   287,117.55x = 33,061,316,214.55
5. Step 5: Solve for x
   x = 33,061,316,214.55/287,117.55
6. Step 6: Final answer
   x = 115,149.06