Finding the Fourth Proportional to 31,106.08, 42,892.52 and 21,017.04

Step by Step Solution

1. Step 1: Write the proportion equation
   31,106.08 : 42,892.52 = 21,017.04 : x
2. Step 2: Convert to fraction form
   31,106.08/42,892.52 = 21,017.04/x
3. Step 3: Cross multiply
   31,106.08x = 42,892.52 × 21,017.04
4. Step 4: Simplify right side
   31,106.08x = 901,473,808.54
5. Step 5: Solve for x
   x = 901,473,808.54/31,106.08
6. Step 6: Final answer
   x = 28,980.63