Finding the Fourth Proportional to 105,180.46, 145,302.56 and 91,008.70

Step by Step Solution

1. Step 1: Write the proportion equation
   105,180.46 : 145,302.56 = 91,008.70 : x
2. Step 2: Convert to fraction form
   105,180.46/145,302.56 = 91,008.70/x
3. Step 3: Cross multiply
   105,180.46x = 145,302.56 × 91,008.70
4. Step 4: Simplify right side
   105,180.46x = 13,223,796,615.25
5. Step 5: Solve for x
   x = 13,223,796,615.25/105,180.46
6. Step 6: Final answer
   x = 125,724.84