Finding the Fourth Proportional to 78,648.71, 117,979.86 and 21,722.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78,648.71 : 117,979.86 = 21,722.63 : x
2. Step 2: Convert to fraction form
   78,648.71/117,979.86 = 21,722.63/x
3. Step 3: Cross multiply
   78,648.71x = 117,979.86 × 21,722.63
4. Step 4: Simplify right side
   78,648.71x = 2,562,832,256.33
5. Step 5: Solve for x
   x = 2,562,832,256.33/78,648.71
6. Step 6: Final answer
   x = 32,585.82