Finding the Fourth Proportional to 105,088.04, 145,020.29 and 57,342.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,088.04 : 145,020.29 = 57,342.18 : x
2. Step 2: Convert to fraction form
   105,088.04/145,020.29 = 57,342.18/x
3. Step 3: Cross multiply
   105,088.04x = 145,020.29 × 57,342.18
4. Step 4: Simplify right side
   105,088.04x = 8,315,780,152.50
5. Step 5: Solve for x
   x = 8,315,780,152.50/105,088.04
6. Step 6: Final answer
   x = 79,131.56