Finding the Fourth Proportional to 101,978.74, 140,736.92 and 56,657.01

Step by Step Solution

1. Step 1: Write the proportion equation
   101,978.74 : 140,736.92 = 56,657.01 : x
2. Step 2: Convert to fraction form
   101,978.74/140,736.92 = 56,657.01/x
3. Step 3: Cross multiply
   101,978.74x = 140,736.92 × 56,657.01
4. Step 4: Simplify right side
   101,978.74x = 7,973,732,800.52
5. Step 5: Solve for x
   x = 7,973,732,800.52/101,978.74
6. Step 6: Final answer
   x = 78,190.15