Finding the Fourth Proportional to 31,070.16, 42,863.17 and 20,994.92

Step by Step Solution

1. Step 1: Write the proportion equation
   31,070.16 : 42,863.17 = 20,994.92 : x
2. Step 2: Convert to fraction form
   31,070.16/42,863.17 = 20,994.92/x
3. Step 3: Cross multiply
   31,070.16x = 42,863.17 × 20,994.92
4. Step 4: Simplify right side
   31,070.16x = 899,908,825.10
5. Step 5: Solve for x
   x = 899,908,825.10/31,070.16
6. Step 6: Final answer
   x = 28,963.77