Finding the Fourth Proportional to 28,622.84, 39,499.86 and 15,876.30

Step by Step Solution

1. Step 1: Write the proportion equation
   28,622.84 : 39,499.86 = 15,876.30 : x
2. Step 2: Convert to fraction form
   28,622.84/39,499.86 = 15,876.30/x
3. Step 3: Cross multiply
   28,622.84x = 39,499.86 × 15,876.30
4. Step 4: Simplify right side
   28,622.84x = 627,111,627.32
5. Step 5: Solve for x
   x = 627,111,627.32/28,622.84
6. Step 6: Final answer
   x = 21,909.48