Finding the Fourth Proportional to 20,858.32, 31,287.50 and 5,275.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,858.32 : 31,287.50 = 5,275.94 : x
2. Step 2: Convert to fraction form
   20,858.32/31,287.50 = 5,275.94/x
3. Step 3: Cross multiply
   20,858.32x = 31,287.50 × 5,275.94
4. Step 4: Simplify right side
   20,858.32x = 165,070,946.37
5. Step 5: Solve for x
   x = 165,070,946.37/20,858.32
6. Step 6: Final answer
   x = 7,913.92