Finding the Fourth Proportional to 31,085.64, 42,897.60 and 16,938.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,085.64 : 42,897.60 = 16,938.18 : x
2. Step 2: Convert to fraction form
   31,085.64/42,897.60 = 16,938.18/x
3. Step 3: Cross multiply
   31,085.64x = 42,897.60 × 16,938.18
4. Step 4: Simplify right side
   31,085.64x = 726,607,270.37
5. Step 5: Solve for x
   x = 726,607,270.37/31,085.64
6. Step 6: Final answer
   x = 23,374.37