Finding the Fourth Proportional to 28,603.83, 42,905.61 and 7,256.55

Step by Step Solution

1. Step 1: Write the proportion equation
   28,603.83 : 42,905.61 = 7,256.55 : x
2. Step 2: Convert to fraction form
   28,603.83/42,905.61 = 7,256.55/x
3. Step 3: Cross multiply
   28,603.83x = 42,905.61 × 7,256.55
4. Step 4: Simplify right side
   28,603.83x = 311,346,704.25
5. Step 5: Solve for x
   x = 311,346,704.25/28,603.83
6. Step 6: Final answer
   x = 10,884.79