Finding the Fourth Proportional to 101,656.78, 140,287.15 and 56,335.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,656.78 : 140,287.15 = 56,335.50 : x
2. Step 2: Convert to fraction form
   101,656.78/140,287.15 = 56,335.50/x
3. Step 3: Cross multiply
   101,656.78x = 140,287.15 × 56,335.50
4. Step 4: Simplify right side
   101,656.78x = 7,903,146,888.47
5. Step 5: Solve for x
   x = 7,903,146,888.47/101,656.78
6. Step 6: Final answer
   x = 77,743.43