Finding the Fourth Proportional to 39,061.53, 53,904.96 and 21,156.68

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.53 : 53,904.96 = 21,156.68 : x
2. Step 2: Convert to fraction form
   39,061.53/53,904.96 = 21,156.68/x
3. Step 3: Cross multiply
   39,061.53x = 53,904.96 × 21,156.68
4. Step 4: Simplify right side
   39,061.53x = 1,140,450,123.90
5. Step 5: Solve for x
   x = 1,140,450,123.90/39,061.53
6. Step 6: Final answer
   x = 29,196.25