Finding the Fourth Proportional to 91,900.20, 137,817.90 and 42,004.20

Step by Step Solution

1. Step 1: Write the proportion equation
   91,900.20 : 137,817.90 = 42,004.20 : x
2. Step 2: Convert to fraction form
   91,900.20/137,817.90 = 42,004.20/x
3. Step 3: Cross multiply
   91,900.20x = 137,817.90 × 42,004.20
4. Step 4: Simplify right side
   91,900.20x = 5,788,930,635.18
5. Step 5: Solve for x
   x = 5,788,930,635.18/91,900.20
6. Step 6: Final answer
   x = 62,991.49