Finding the Fourth Proportional to 28,656.16, 42,996.56 and 13,876.16

Step by Step Solution

1. Step 1: Write the proportion equation
   28,656.16 : 42,996.56 = 13,876.16 : x
2. Step 2: Convert to fraction form
   28,656.16/42,996.56 = 13,876.16/x
3. Step 3: Cross multiply
   28,656.16x = 42,996.56 × 13,876.16
4. Step 4: Simplify right side
   28,656.16x = 596,627,146.01
5. Step 5: Solve for x
   x = 596,627,146.01/28,656.16
6. Step 6: Final answer
   x = 20,820.21