Finding the Fourth Proportional to 105,345.72, 145,376.10 and 57,598.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,345.72 : 145,376.10 = 57,598.56 : x
2. Step 2: Convert to fraction form
   105,345.72/145,376.10 = 57,598.56/x
3. Step 3: Cross multiply
   105,345.72x = 145,376.10 × 57,598.56
4. Step 4: Simplify right side
   105,345.72x = 8,373,454,018.42
5. Step 5: Solve for x
   x = 8,373,454,018.42/105,345.72
6. Step 6: Final answer
   x = 79,485.47