Finding the Fourth Proportional to 6,980.86, 10,428.86 and 4,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   6,980.86 : 10,428.86 = 4,990.69 : x
2. Step 2: Convert to fraction form
   6,980.86/10,428.86 = 4,990.69/x
3. Step 3: Cross multiply
   6,980.86x = 10,428.86 × 4,990.69
4. Step 4: Simplify right side
   6,980.86x = 52,047,178.93
5. Step 5: Solve for x
   x = 52,047,178.93/6,980.86
6. Step 6: Final answer
   x = 7,455.70