Finding the Fourth Proportional to 40,990.18, 61,484.45 and 13,288.18

Step by Step Solution

1. Step 1: Write the proportion equation
   40,990.18 : 61,484.45 = 13,288.18 : x
2. Step 2: Convert to fraction form
   40,990.18/61,484.45 = 13,288.18/x
3. Step 3: Cross multiply
   40,990.18x = 61,484.45 × 13,288.18
4. Step 4: Simplify right side
   40,990.18x = 817,016,131.38
5. Step 5: Solve for x
   x = 817,016,131.38/40,990.18
6. Step 6: Final answer
   x = 19,932.00