Finding the Fourth Proportional to 28,196.62, 42,291.57 and 7,421.74

Step by Step Solution

1. Step 1: Write the proportion equation
   28,196.62 : 42,291.57 = 7,421.74 : x
2. Step 2: Convert to fraction form
   28,196.62/42,291.57 = 7,421.74/x
3. Step 3: Cross multiply
   28,196.62x = 42,291.57 × 7,421.74
4. Step 4: Simplify right side
   28,196.62x = 313,877,036.73
5. Step 5: Solve for x
   x = 313,877,036.73/28,196.62
6. Step 6: Final answer
   x = 11,131.73