Finding the Fourth Proportional to 39,061.60, 53,905.14 and 21,156.56

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.60 : 53,905.14 = 21,156.56 : x
2. Step 2: Convert to fraction form
   39,061.60/53,905.14 = 21,156.56/x
3. Step 3: Cross multiply
   39,061.60x = 53,905.14 × 21,156.56
4. Step 4: Simplify right side
   39,061.60x = 1,140,447,328.72
5. Step 5: Solve for x
   x = 1,140,447,328.72/39,061.60
6. Step 6: Final answer
   x = 29,196.12