Finding the Fourth Proportional to 156,492, 215,958.96 and 89,424

Step by Step Solution

1. Step 1: Write the proportion equation
   156,492 : 215,958.96 = 89,424 : x
2. Step 2: Convert to fraction form
   156,492/215,958.96 = 89,424/x
3. Step 3: Cross multiply
   156,492x = 215,958.96 × 89,424
4. Step 4: Simplify right side
   156,492x = 19,311,914,039.04
5. Step 5: Solve for x
   x = 19,311,914,039.04/156,492
6. Step 6: Final answer
   x = 123,405.12