Finding the Fourth Proportional to 101,640.48, 140,263.72 and 56,321.39

Step by Step Solution

1. Step 1: Write the proportion equation
   101,640.48 : 140,263.72 = 56,321.39 : x
2. Step 2: Convert to fraction form
   101,640.48/140,263.72 = 56,321.39/x
3. Step 3: Cross multiply
   101,640.48x = 140,263.72 × 56,321.39
4. Step 4: Simplify right side
   101,640.48x = 7,899,847,886.83
5. Step 5: Solve for x
   x = 7,899,847,886.83/101,640.48
6. Step 6: Final answer
   x = 77,723.45