Finding the Fourth Proportional to 88,990.24, 133,500.12 and 42,217.60

Step by Step Solution

1. Step 1: Write the proportion equation
   88,990.24 : 133,500.12 = 42,217.60 : x
2. Step 2: Convert to fraction form
   88,990.24/133,500.12 = 42,217.60/x
3. Step 3: Cross multiply
   88,990.24x = 133,500.12 × 42,217.60
4. Step 4: Simplify right side
   88,990.24x = 5,636,054,666.11
5. Step 5: Solve for x
   x = 5,636,054,666.11/88,990.24
6. Step 6: Final answer
   x = 63,333.40