Finding the Fourth Proportional to 105,417.18, 145,477.47 and 57,670.86

Step by Step Solution

1. Step 1: Write the proportion equation
   105,417.18 : 145,477.47 = 57,670.86 : x
2. Step 2: Convert to fraction form
   105,417.18/145,477.47 = 57,670.86/x
3. Step 3: Cross multiply
   105,417.18x = 145,477.47 × 57,670.86
4. Step 4: Simplify right side
   105,417.18x = 8,389,810,805.52
5. Step 5: Solve for x
   x = 8,389,810,805.52/105,417.18
6. Step 6: Final answer
   x = 79,586.75