Finding the Fourth Proportional to 39,061.12, 53,904.32 and 21,156.18

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.12 : 53,904.32 = 21,156.18 : x
2. Step 2: Convert to fraction form
   39,061.12/53,904.32 = 21,156.18/x
3. Step 3: Cross multiply
   39,061.12x = 53,904.32 × 21,156.18
4. Step 4: Simplify right side
   39,061.12x = 1,140,409,496.70
5. Step 5: Solve for x
   x = 1,140,409,496.70/39,061.12
6. Step 6: Final answer
   x = 29,195.51