Finding the Fourth Proportional to 38,978.29, 53,790.05 and 21,073.29

Step by Step Solution

1. Step 1: Write the proportion equation
   38,978.29 : 53,790.05 = 21,073.29 : x
2. Step 2: Convert to fraction form
   38,978.29/53,790.05 = 21,073.29/x
3. Step 3: Cross multiply
   38,978.29x = 53,790.05 × 21,073.29
4. Step 4: Simplify right side
   38,978.29x = 1,133,533,322.76
5. Step 5: Solve for x
   x = 1,133,533,322.76/38,978.29
6. Step 6: Final answer
   x = 29,081.15