Finding the Fourth Proportional to 105,140.83, 145,088.83 and 57,384.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105,140.83 : 145,088.83 = 57,384.91 : x
2. Step 2: Convert to fraction form
   105,140.83/145,088.83 = 57,384.91/x
3. Step 3: Cross multiply
   105,140.83x = 145,088.83 × 57,384.91
4. Step 4: Simplify right side
   105,140.83x = 8,325,909,451.56
5. Step 5: Solve for x
   x = 8,325,909,451.56/105,140.83
6. Step 6: Final answer
   x = 79,188.17