Finding the Fourth Proportional to 31,111, 46,663.98 and 12,390.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,111 : 46,663.98 = 12,390.28 : x
2. Step 2: Convert to fraction form
   31,111/46,663.98 = 12,390.28/x
3. Step 3: Cross multiply
   31,111x = 46,663.98 × 12,390.28
4. Step 4: Simplify right side
   31,111x = 578,179,778.11
5. Step 5: Solve for x
   x = 578,179,778.11/31,111
6. Step 6: Final answer
   x = 18,584.42