Finding the Fourth Proportional to 156,978.78, 235,409.85 and 51,769.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978.78 : 235,409.85 = 51,769.50 : x
2. Step 2: Convert to fraction form
   156,978.78/235,409.85 = 51,769.50/x
3. Step 3: Cross multiply
   156,978.78x = 235,409.85 × 51,769.50
4. Step 4: Simplify right side
   156,978.78x = 12,187,050,229.58
5. Step 5: Solve for x
   x = 12,187,050,229.58/156,978.78
6. Step 6: Final answer
   x = 77,635.02