Finding the Fourth Proportional to 31,036.70, 42,830.88 and 16,889.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,036.70 : 42,830.88 = 16,889.50 : x
2. Step 2: Convert to fraction form
   31,036.70/42,830.88 = 16,889.50/x
3. Step 3: Cross multiply
   31,036.70x = 42,830.88 × 16,889.50
4. Step 4: Simplify right side
   31,036.70x = 723,392,147.76
5. Step 5: Solve for x
   x = 723,392,147.76/31,036.70
6. Step 6: Final answer
   x = 23,307.64