Finding the Fourth Proportional to 139,710.64, 209,609.72 and 89,847.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,710.64 : 209,609.72 = 89,847.04 : x
2. Step 2: Convert to fraction form
   139,710.64/209,609.72 = 89,847.04/x
3. Step 3: Cross multiply
   139,710.64x = 209,609.72 × 89,847.04
4. Step 4: Simplify right side
   139,710.64x = 18,832,812,897.23
5. Step 5: Solve for x
   x = 18,832,812,897.23/139,710.64
6. Step 6: Final answer
   x = 134,798.70