Finding the Fourth Proportional to 31,097.09, 42,880.10 and 21,008.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,097.09 : 42,880.10 = 21,008.02 : x
2. Step 2: Convert to fraction form
   31,097.09/42,880.10 = 21,008.02/x
3. Step 3: Cross multiply
   31,097.09x = 42,880.10 × 21,008.02
4. Step 4: Simplify right side
   31,097.09x = 900,825,998.40
5. Step 5: Solve for x
   x = 900,825,998.40/31,097.09
6. Step 6: Final answer
   x = 28,968.18