Finding the Fourth Proportional to 31,071.04, 42,863.37 and 21,002.99

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.04 : 42,863.37 = 21,002.99 : x
2. Step 2: Convert to fraction form
   31,071.04/42,863.37 = 21,002.99/x
3. Step 3: Cross multiply
   31,071.04x = 42,863.37 × 21,002.99
4. Step 4: Simplify right side
   31,071.04x = 900,258,931.48
5. Step 5: Solve for x
   x = 900,258,931.48/31,071.04
6. Step 6: Final answer
   x = 28,974.21