Finding the Fourth Proportional to 31,046.46, 42,845.06 and 21,988.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,046.46 : 42,845.06 = 21,988.05 : x
2. Step 2: Convert to fraction form
   31,046.46/42,845.06 = 21,988.05/x
3. Step 3: Cross multiply
   31,046.46x = 42,845.06 × 21,988.05
4. Step 4: Simplify right side
   31,046.46x = 942,079,211.59
5. Step 5: Solve for x
   x = 942,079,211.59/31,046.46
6. Step 6: Final answer
   x = 30,344.17