Finding the Fourth Proportional to 81,601.30, 122,303.52 and 42,136.90

Step by Step Solution

1. Step 1: Write the proportion equation
   81,601.30 : 122,303.52 = 42,136.90 : x
2. Step 2: Convert to fraction form
   81,601.30/122,303.52 = 42,136.90/x
3. Step 3: Cross multiply
   81,601.30x = 122,303.52 × 42,136.90
4. Step 4: Simplify right side
   81,601.30x = 5,153,491,602.99
5. Step 5: Solve for x
   x = 5,153,491,602.99/81,601.30
6. Step 6: Final answer
   x = 63,154.53