Finding the Fourth Proportional to 28,308.02, 42,445.56 and 20,816.06

Step by Step Solution

1. Step 1: Write the proportion equation
   28,308.02 : 42,445.56 = 20,816.06 : x
2. Step 2: Convert to fraction form
   28,308.02/42,445.56 = 20,816.06/x
3. Step 3: Cross multiply
   28,308.02x = 42,445.56 × 20,816.06
4. Step 4: Simplify right side
   28,308.02x = 883,549,323.69
5. Step 5: Solve for x
   x = 883,549,323.69/28,308.02
6. Step 6: Final answer
   x = 31,211.98