Finding the Fourth Proportional to 105,666.62, 145,819.28 and 57,921.98

Step by Step Solution

1. Step 1: Write the proportion equation
   105,666.62 : 145,819.28 = 57,921.98 : x
2. Step 2: Convert to fraction form
   105,666.62/145,819.28 = 57,921.98/x
3. Step 3: Cross multiply
   105,666.62x = 145,819.28 × 57,921.98
4. Step 4: Simplify right side
   105,666.62x = 8,446,141,130.16
5. Step 5: Solve for x
   x = 8,446,141,130.16/105,666.62
6. Step 6: Final answer
   x = 79,931.97