Finding the Fourth Proportional to 28,488.42, 42,735.06 and 7,431.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,488.42 : 42,735.06 = 7,431.25 : x
2. Step 2: Convert to fraction form
   28,488.42/42,735.06 = 7,431.25/x
3. Step 3: Cross multiply
   28,488.42x = 42,735.06 × 7,431.25
4. Step 4: Simplify right side
   28,488.42x = 317,574,914.63
5. Step 5: Solve for x
   x = 317,574,914.63/28,488.42
6. Step 6: Final answer
   x = 11,147.51