Finding the Fourth Proportional to 105,574.18, 145,706.86 and 64,731.08

Step by Step Solution

1. Step 1: Write the proportion equation
   105,574.18 : 145,706.86 = 64,731.08 : x
2. Step 2: Convert to fraction form
   105,574.18/145,706.86 = 64,731.08/x
3. Step 3: Cross multiply
   105,574.18x = 145,706.86 × 64,731.08
4. Step 4: Simplify right side
   105,574.18x = 9,431,762,411.21
5. Step 5: Solve for x
   x = 9,431,762,411.21/105,574.18
6. Step 6: Final answer
   x = 89,337.78