Finding the Fourth Proportional to 101,171.50, 139,663.90 and 58,721.82

Step by Step Solution

1. Step 1: Write the proportion equation
   101,171.50 : 139,663.90 = 58,721.82 : x
2. Step 2: Convert to fraction form
   101,171.50/139,663.90 = 58,721.82/x
3. Step 3: Cross multiply
   101,171.50x = 139,663.90 × 58,721.82
4. Step 4: Simplify right side
   101,171.50x = 8,201,318,396.30
5. Step 5: Solve for x
   x = 8,201,318,396.30/101,171.50
6. Step 6: Final answer
   x = 81,063.52