Finding the Fourth Proportional to 285,677.55, 428,545.49 and 98,664.75

Step by Step Solution

1. Step 1: Write the proportion equation
   285,677.55 : 428,545.49 = 98,664.75 : x
2. Step 2: Convert to fraction form
   285,677.55/428,545.49 = 98,664.75/x
3. Step 3: Cross multiply
   285,677.55x = 428,545.49 × 98,664.75
4. Step 4: Simplify right side
   285,677.55x = 42,282,333,141.15
5. Step 5: Solve for x
   x = 42,282,333,141.15/285,677.55
6. Step 6: Final answer
   x = 148,007.20