Finding the Fourth Proportional to 101,243.25, 139,715.69 and 56,531.25

Step by Step Solution

1. Step 1: Write the proportion equation
   101,243.25 : 139,715.69 = 56,531.25 : x
2. Step 2: Convert to fraction form
   101,243.25/139,715.69 = 56,531.25/x
3. Step 3: Cross multiply
   101,243.25x = 139,715.69 × 56,531.25
4. Step 4: Simplify right side
   101,243.25x = 7,898,302,317.66
5. Step 5: Solve for x
   x = 7,898,302,317.66/101,243.25
6. Step 6: Final answer
   x = 78,013.13