Finding the Fourth Proportional to 212,501.61, 318,650.76 and 123,780.42

Step by Step Solution

1. Step 1: Write the proportion equation
   212,501.61 : 318,650.76 = 123,780.42 : x
2. Step 2: Convert to fraction form
   212,501.61/318,650.76 = 123,780.42/x
3. Step 3: Cross multiply
   212,501.61x = 318,650.76 × 123,780.42
4. Step 4: Simplify right side
   212,501.61x = 39,442,724,906.12
5. Step 5: Solve for x
   x = 39,442,724,906.12/212,501.61
6. Step 6: Final answer
   x = 185,611.42