Finding the Fourth Proportional to 28,409.31, 42,614.01 and 12,808.71

Step by Step Solution

1. Step 1: Write the proportion equation
   28,409.31 : 42,614.01 = 12,808.71 : x
2. Step 2: Convert to fraction form
   28,409.31/42,614.01 = 12,808.71/x
3. Step 3: Cross multiply
   28,409.31x = 42,614.01 × 12,808.71
4. Step 4: Simplify right side
   28,409.31x = 545,830,496.03
5. Step 5: Solve for x
   x = 545,830,496.03/28,409.31
6. Step 6: Final answer
   x = 19,213.09