Finding the Fourth Proportional to 6,428.13, 8,870.88 and 3,775.59

Step by Step Solution

1. Step 1: Write the proportion equation
   6,428.13 : 8,870.88 = 3,775.59 : x
2. Step 2: Convert to fraction form
   6,428.13/8,870.88 = 3,775.59/x
3. Step 3: Cross multiply
   6,428.13x = 8,870.88 × 3,775.59
4. Step 4: Simplify right side
   6,428.13x = 33,492,805.82
5. Step 5: Solve for x
   x = 33,492,805.82/6,428.13
6. Step 6: Final answer
   x = 5,210.35