Finding the Fourth Proportional to 10,521.63, 15,772.59 and 5,253.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.63 : 15,772.59 = 5,253.39 : x
2. Step 2: Convert to fraction form
   10,521.63/15,772.59 = 5,253.39/x
3. Step 3: Cross multiply
   10,521.63x = 15,772.59 × 5,253.39
4. Step 4: Simplify right side
   10,521.63x = 82,859,566.58
5. Step 5: Solve for x
   x = 82,859,566.58/10,521.63
6. Step 6: Final answer
   x = 7,875.16