Finding the Fourth Proportional to 101,978.01, 140,729.52 and 56,660.17

Step by Step Solution

1. Step 1: Write the proportion equation
   101,978.01 : 140,729.52 = 56,660.17 : x
2. Step 2: Convert to fraction form
   101,978.01/140,729.52 = 56,660.17/x
3. Step 3: Cross multiply
   101,978.01x = 140,729.52 × 56,660.17
4. Step 4: Simplify right side
   101,978.01x = 7,973,758,527.22
5. Step 5: Solve for x
   x = 7,973,758,527.22/101,978.01
6. Step 6: Final answer
   x = 78,190.96