Finding the Fourth Proportional to 105,522.32, 145,619.84 and 57,124.01

Step by Step Solution

1. Step 1: Write the proportion equation
   105,522.32 : 145,619.84 = 57,124.01 : x
2. Step 2: Convert to fraction form
   105,522.32/145,619.84 = 57,124.01/x
3. Step 3: Cross multiply
   105,522.32x = 145,619.84 × 57,124.01
4. Step 4: Simplify right side
   105,522.32x = 8,318,388,182.64
5. Step 5: Solve for x
   x = 8,318,388,182.64/105,522.32
6. Step 6: Final answer
   x = 78,830.61