Finding the Fourth Proportional to 101,331.72, 139,837.50 and 56,619.72

Step by Step Solution

1. Step 1: Write the proportion equation
   101,331.72 : 139,837.50 = 56,619.72 : x
2. Step 2: Convert to fraction form
   101,331.72/139,837.50 = 56,619.72/x
3. Step 3: Cross multiply
   101,331.72x = 139,837.50 × 56,619.72
4. Step 4: Simplify right side
   101,331.72x = 7,917,560,095.50
5. Step 5: Solve for x
   x = 7,917,560,095.50/101,331.72
6. Step 6: Final answer
   x = 78,135.06