Finding the Fourth Proportional to 105,346.98, 145,378.86 and 57,600.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,346.98 : 145,378.86 = 57,600.72 : x
2. Step 2: Convert to fraction form
   105,346.98/145,378.86 = 57,600.72/x
3. Step 3: Cross multiply
   105,346.98x = 145,378.86 × 57,600.72
4. Step 4: Simplify right side
   105,346.98x = 8,373,927,008.78
5. Step 5: Solve for x
   x = 8,373,927,008.78/105,346.98
6. Step 6: Final answer
   x = 79,489.01