Finding the Fourth Proportional to 21,055.59, 31,566.74 and 7,906.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,055.59 : 31,566.74 = 7,906.50 : x
2. Step 2: Convert to fraction form
   21,055.59/31,566.74 = 7,906.50/x
3. Step 3: Cross multiply
   21,055.59x = 31,566.74 × 7,906.50
4. Step 4: Simplify right side
   21,055.59x = 249,582,390.28
5. Step 5: Solve for x
   x = 249,582,390.28/21,055.59
6. Step 6: Final answer
   x = 11,853.50