Finding the Fourth Proportional to 156,080.21, 215,391.69 and 91,536.29

Step by Step Solution

1. Step 1: Write the proportion equation
   156,080.21 : 215,391.69 = 91,536.29 : x
2. Step 2: Convert to fraction form
   156,080.21/215,391.69 = 91,536.29/x
3. Step 3: Cross multiply
   156,080.21x = 215,391.69 × 91,536.29
4. Step 4: Simplify right side
   156,080.21x = 19,716,156,199.43
5. Step 5: Solve for x
   x = 19,716,156,199.43/156,080.21
6. Step 6: Final answer
   x = 126,320.67