Finding the Fourth Proportional to 243,123.86, 364,848.69 and 85,352.78

Step by Step Solution

1. Step 1: Write the proportion equation
   243,123.86 : 364,848.69 = 85,352.78 : x
2. Step 2: Convert to fraction form
   243,123.86/364,848.69 = 85,352.78/x
3. Step 3: Cross multiply
   243,123.86x = 364,848.69 × 85,352.78
4. Step 4: Simplify right side
   243,123.86x = 31,140,849,970.86
5. Step 5: Solve for x
   x = 31,140,849,970.86/243,123.86
6. Step 6: Final answer
   x = 128,086.36