Finding the Fourth Proportional to 10,521.49, 15,781.69 and 3,126.01

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.49 : 15,781.69 = 3,126.01 : x
2. Step 2: Convert to fraction form
   10,521.49/15,781.69 = 3,126.01/x
3. Step 3: Cross multiply
   10,521.49x = 15,781.69 × 3,126.01
4. Step 4: Simplify right side
   10,521.49x = 49,333,720.76
5. Step 5: Solve for x
   x = 49,333,720.76/10,521.49
6. Step 6: Final answer
   x = 4,688.85