Finding the Fourth Proportional to 42,393, 63,590.72 and 11,228.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,393 : 63,590.72 = 11,228.25 : x
2. Step 2: Convert to fraction form
   42,393/63,590.72 = 11,228.25/x
3. Step 3: Cross multiply
   42,393x = 63,590.72 × 11,228.25
4. Step 4: Simplify right side
   42,393x = 714,012,445.70
5. Step 5: Solve for x
   x = 714,012,445.70/42,393
6. Step 6: Final answer
   x = 16,842.70