Finding the Fourth Proportional to 77,196.27, 115,778.17 and 21,779.31

Step by Step Solution

1. Step 1: Write the proportion equation
   77,196.27 : 115,778.17 = 21,779.31 : x
2. Step 2: Convert to fraction form
   77,196.27/115,778.17 = 21,779.31/x
3. Step 3: Cross multiply
   77,196.27x = 115,778.17 × 21,779.31
4. Step 4: Simplify right side
   77,196.27x = 2,521,568,655.66
5. Step 5: Solve for x
   x = 2,521,568,655.66/77,196.27
6. Step 6: Final answer
   x = 32,664.38