Finding the Fourth Proportional to 39,061.77, 53,904.60 and 21,156.63

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.77 : 53,904.60 = 21,156.63 : x
2. Step 2: Convert to fraction form
   39,061.77/53,904.60 = 21,156.63/x
3. Step 3: Cross multiply
   39,061.77x = 53,904.60 × 21,156.63
4. Step 4: Simplify right side
   39,061.77x = 1,140,439,677.50
5. Step 5: Solve for x
   x = 1,140,439,677.50/39,061.77
6. Step 6: Final answer
   x = 29,195.80