Finding the Fourth Proportional to 10,917.99, 16,386.71 and 5,077.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,917.99 : 16,386.71 = 5,077.89 : x
2. Step 2: Convert to fraction form
   10,917.99/16,386.71 = 5,077.89/x
3. Step 3: Cross multiply
   10,917.99x = 16,386.71 × 5,077.89
4. Step 4: Simplify right side
   10,917.99x = 83,209,885.45
5. Step 5: Solve for x
   x = 83,209,885.45/10,917.99
6. Step 6: Final answer
   x = 7,621.36