Finding the Fourth Proportional to 101,021.52, 139,469.43 and 89,812.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,021.52 : 139,469.43 = 89,812.50 : x
2. Step 2: Convert to fraction form
   101,021.52/139,469.43 = 89,812.50/x
3. Step 3: Cross multiply
   101,021.52x = 139,469.43 × 89,812.50
4. Step 4: Simplify right side
   101,021.52x = 12,526,098,181.88
5. Step 5: Solve for x
   x = 12,526,098,181.88/101,021.52
6. Step 6: Final answer
   x = 123,994.35