Finding the Fourth Proportional to 87,643, 131,398.89 and 28,443.34

Step by Step Solution

1. Step 1: Write the proportion equation
   87,643 : 131,398.89 = 28,443.34 : x
2. Step 2: Convert to fraction form
   87,643/131,398.89 = 28,443.34/x
3. Step 3: Cross multiply
   87,643x = 131,398.89 × 28,443.34
4. Step 4: Simplify right side
   87,643x = 3,737,423,303.89
5. Step 5: Solve for x
   x = 3,737,423,303.89/87,643
6. Step 6: Final answer
   x = 42,643.72