Finding the Fourth Proportional to 149,819.04, 206,748.72 and 86,155.20

Step by Step Solution

1. Step 1: Write the proportion equation
   149,819.04 : 206,748.72 = 86,155.20 : x
2. Step 2: Convert to fraction form
   149,819.04/206,748.72 = 86,155.20/x
3. Step 3: Cross multiply
   149,819.04x = 206,748.72 × 86,155.20
4. Step 4: Simplify right side
   149,819.04x = 17,812,477,321.34
5. Step 5: Solve for x
   x = 17,812,477,321.34/149,819.04
6. Step 6: Final answer
   x = 118,893.28