Finding the Fourth Proportional to 78,123.52, 107,809.60 and 42,312.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,123.52 : 107,809.60 = 42,312.64 : x
2. Step 2: Convert to fraction form
   78,123.52/107,809.60 = 42,312.64/x
3. Step 3: Cross multiply
   78,123.52x = 107,809.60 × 42,312.64
4. Step 4: Simplify right side
   78,123.52x = 4,561,708,793.34
5. Step 5: Solve for x
   x = 4,561,708,793.34/78,123.52
6. Step 6: Final answer
   x = 58,390.98