Finding the Fourth Proportional to 72,141.06, 108,217.72 and 18,840.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,141.06 : 108,217.72 = 18,840.10 : x
2. Step 2: Convert to fraction form
   72,141.06/108,217.72 = 18,840.10/x
3. Step 3: Cross multiply
   72,141.06x = 108,217.72 × 18,840.10
4. Step 4: Simplify right side
   72,141.06x = 2,038,832,666.57
5. Step 5: Solve for x
   x = 2,038,832,666.57/72,141.06
6. Step 6: Final answer
   x = 28,261.75