Finding the Fourth Proportional to 105,461.32, 145,598.10 and 91,291.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,461.32 : 145,598.10 = 91,291.72 : x
2. Step 2: Convert to fraction form
   105,461.32/145,598.10 = 91,291.72/x
3. Step 3: Cross multiply
   105,461.32x = 145,598.10 × 91,291.72
4. Step 4: Simplify right side
   105,461.32x = 13,291,900,977.73
5. Step 5: Solve for x
   x = 13,291,900,977.73/105,461.32
6. Step 6: Final answer
   x = 126,035.79