Finding the Fourth Proportional to 6,887.21, 9,503.46 and 3,902.99

Step by Step Solution

1. Step 1: Write the proportion equation
   6,887.21 : 9,503.46 = 3,902.99 : x
2. Step 2: Convert to fraction form
   6,887.21/9,503.46 = 3,902.99/x
3. Step 3: Cross multiply
   6,887.21x = 9,503.46 × 3,902.99
4. Step 4: Simplify right side
   6,887.21x = 37,091,861.83
5. Step 5: Solve for x
   x = 37,091,861.83/6,887.21
6. Step 6: Final answer
   x = 5,385.62