Finding the Fourth Proportional to 105,574.17, 145,637.15 and 65,275.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105,574.17 : 145,637.15 = 65,275.05 : x
2. Step 2: Convert to fraction form
   105,574.17/145,637.15 = 65,275.05/x
3. Step 3: Cross multiply
   105,574.17x = 145,637.15 × 65,275.05
4. Step 4: Simplify right side
   105,574.17x = 9,506,471,921.73
5. Step 5: Solve for x
   x = 9,506,471,921.73/105,574.17
6. Step 6: Final answer
   x = 90,045.43