Finding the Fourth Proportional to 31,005.54, 42,773.94 and 18,423

Step by Step Solution

1. Step 1: Write the proportion equation
   31,005.54 : 42,773.94 = 18,423 : x
2. Step 2: Convert to fraction form
   31,005.54/42,773.94 = 18,423/x
3. Step 3: Cross multiply
   31,005.54x = 42,773.94 × 18,423
4. Step 4: Simplify right side
   31,005.54x = 788,024,296.62
5. Step 5: Solve for x
   x = 788,024,296.62/31,005.54
6. Step 6: Final answer
   x = 25,415.60