Finding the Fourth Proportional to 10,619.71, 15,915.69 and 4,372.58

Step by Step Solution

1. Step 1: Write the proportion equation
   10,619.71 : 15,915.69 = 4,372.58 : x
2. Step 2: Convert to fraction form
   10,619.71/15,915.69 = 4,372.58/x
3. Step 3: Cross multiply
   10,619.71x = 15,915.69 × 4,372.58
4. Step 4: Simplify right side
   10,619.71x = 69,592,667.57
5. Step 5: Solve for x
   x = 69,592,667.57/10,619.71
6. Step 6: Final answer
   x = 6,553.16