Finding the Fourth Proportional to 156,499.32, 234,348.30 and 86,300.76

Step by Step Solution

1. Step 1: Write the proportion equation
   156,499.32 : 234,348.30 = 86,300.76 : x
2. Step 2: Convert to fraction form
   156,499.32/234,348.30 = 86,300.76/x
3. Step 3: Cross multiply
   156,499.32x = 234,348.30 × 86,300.76
4. Step 4: Simplify right side
   156,499.32x = 20,224,436,394.71
5. Step 5: Solve for x
   x = 20,224,436,394.71/156,499.32
6. Step 6: Final answer
   x = 129,230.19