Finding the Fourth Proportional to 78,488.16, 117,719.61 and 21,548.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,488.16 : 117,719.61 = 21,548.78 : x
2. Step 2: Convert to fraction form
   78,488.16/117,719.61 = 21,548.78/x
3. Step 3: Cross multiply
   78,488.16x = 117,719.61 × 21,548.78
4. Step 4: Simplify right side
   78,488.16x = 2,536,713,977.58
5. Step 5: Solve for x
   x = 2,536,713,977.58/78,488.16
6. Step 6: Final answer
   x = 32,319.70