Finding the Fourth Proportional to 31,109.92, 42,946.14 and 18,358.90

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.92 : 42,946.14 = 18,358.90 : x
2. Step 2: Convert to fraction form
   31,109.92/42,946.14 = 18,358.90/x
3. Step 3: Cross multiply
   31,109.92x = 42,946.14 × 18,358.90
4. Step 4: Simplify right side
   31,109.92x = 788,443,889.65
5. Step 5: Solve for x
   x = 788,443,889.65/31,109.92
6. Step 6: Final answer
   x = 25,343.81