Finding the Fourth Proportional to 28,499.16, 42,714.08 and 21,456.48

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.16 : 42,714.08 = 21,456.48 : x
2. Step 2: Convert to fraction form
   28,499.16/42,714.08 = 21,456.48/x
3. Step 3: Cross multiply
   28,499.16x = 42,714.08 × 21,456.48
4. Step 4: Simplify right side
   28,499.16x = 916,493,803.24
5. Step 5: Solve for x
   x = 916,493,803.24/28,499.16
6. Step 6: Final answer
   x = 32,158.63