Finding the Fourth Proportional to 28,645.34, 42,980.74 and 11,116.52

Step by Step Solution

1. Step 1: Write the proportion equation
   28,645.34 : 42,980.74 = 11,116.52 : x
2. Step 2: Convert to fraction form
   28,645.34/42,980.74 = 11,116.52/x
3. Step 3: Cross multiply
   28,645.34x = 42,980.74 × 11,116.52
4. Step 4: Simplify right side
   28,645.34x = 477,796,255.82
5. Step 5: Solve for x
   x = 477,796,255.82/28,645.34
6. Step 6: Final answer
   x = 16,679.72