Finding the Fourth Proportional to 28,404.10, 42,557.55 and 18,003.70

Step by Step Solution

1. Step 1: Write the proportion equation
   28,404.10 : 42,557.55 = 18,003.70 : x
2. Step 2: Convert to fraction form
   28,404.10/42,557.55 = 18,003.70/x
3. Step 3: Cross multiply
   28,404.10x = 42,557.55 × 18,003.70
4. Step 4: Simplify right side
   28,404.10x = 766,193,362.94
5. Step 5: Solve for x
   x = 766,193,362.94/28,404.10
6. Step 6: Final answer
   x = 26,974.75