Finding the Fourth Proportional to 81,045.18, 121,484.61 and 31,111.83

Step by Step Solution

1. Step 1: Write the proportion equation
   81,045.18 : 121,484.61 = 31,111.83 : x
2. Step 2: Convert to fraction form
   81,045.18/121,484.61 = 31,111.83/x
3. Step 3: Cross multiply
   81,045.18x = 121,484.61 × 31,111.83
4. Step 4: Simplify right side
   81,045.18x = 3,779,608,533.94
5. Step 5: Solve for x
   x = 3,779,608,533.94/81,045.18
6. Step 6: Final answer
   x = 46,635.82