Finding the Fourth Proportional to 31,065.18, 42,870.15 and 16,918.08

Step by Step Solution

1. Step 1: Write the proportion equation
   31,065.18 : 42,870.15 = 16,918.08 : x
2. Step 2: Convert to fraction form
   31,065.18/42,870.15 = 16,918.08/x
3. Step 3: Cross multiply
   31,065.18x = 42,870.15 × 16,918.08
4. Step 4: Simplify right side
   31,065.18x = 725,280,627.31
5. Step 5: Solve for x
   x = 725,280,627.31/31,065.18
6. Step 6: Final answer
   x = 23,347.06