Finding the Fourth Proportional to 31,100.08, 42,884.24 and 21,011.04

Step by Step Solution

1. Step 1: Write the proportion equation
   31,100.08 : 42,884.24 = 21,011.04 : x
2. Step 2: Convert to fraction form
   31,100.08/42,884.24 = 21,011.04/x
3. Step 3: Cross multiply
   31,100.08x = 42,884.24 × 21,011.04
4. Step 4: Simplify right side
   31,100.08x = 901,042,482.01
5. Step 5: Solve for x
   x = 901,042,482.01/31,100.08
6. Step 6: Final answer
   x = 28,972.35