Finding the Fourth Proportional to 9,912.10, 13,678.71 and 5,435.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912.10 : 13,678.71 = 5,435.88 : x
2. Step 2: Convert to fraction form
   9,912.10/13,678.71 = 5,435.88/x
3. Step 3: Cross multiply
   9,912.10x = 13,678.71 × 5,435.88
4. Step 4: Simplify right side
   9,912.10x = 74,355,826.11
5. Step 5: Solve for x
   x = 74,355,826.11/9,912.10
6. Step 6: Final answer
   x = 7,501.52