Finding the Fourth Proportional to 78,086.07, 117,128.66 and 21,926.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,086.07 : 117,128.66 = 21,926.20 : x
2. Step 2: Convert to fraction form
   78,086.07/117,128.66 = 21,926.20/x
3. Step 3: Cross multiply
   78,086.07x = 117,128.66 × 21,926.20
4. Step 4: Simplify right side
   78,086.07x = 2,568,186,424.89
5. Step 5: Solve for x
   x = 2,568,186,424.89/78,086.07
6. Step 6: Final answer
   x = 32,889.18