Finding the Fourth Proportional to 28,025.10, 42,028.50 and 9,300.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,025.10 : 42,028.50 = 9,300.10 : x
2. Step 2: Convert to fraction form
   28,025.10/42,028.50 = 9,300.10/x
3. Step 3: Cross multiply
   28,025.10x = 42,028.50 × 9,300.10
4. Step 4: Simplify right side
   28,025.10x = 390,869,206.35
5. Step 5: Solve for x
   x = 390,869,206.35/28,025.10
6. Step 6: Final answer
   x = 13,947.11