Finding the Fourth Proportional to 31,109.49, 42,937.80 and 18,357.93

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.49 : 42,937.80 = 18,357.93 : x
2. Step 2: Convert to fraction form
   31,109.49/42,937.80 = 18,357.93/x
3. Step 3: Cross multiply
   31,109.49x = 42,937.80 × 18,357.93
4. Step 4: Simplify right side
   31,109.49x = 788,249,126.75
5. Step 5: Solve for x
   x = 788,249,126.75/31,109.49
6. Step 6: Final answer
   x = 25,337.90