Finding the Fourth Proportional to 11,898.54, 16,417.20 and 7,120.02

Step by Step Solution

1. Step 1: Write the proportion equation
   11,898.54 : 16,417.20 = 7,120.02 : x
2. Step 2: Convert to fraction form
   11,898.54/16,417.20 = 7,120.02/x
3. Step 3: Cross multiply
   11,898.54x = 16,417.20 × 7,120.02
4. Step 4: Simplify right side
   11,898.54x = 116,890,792.34
5. Step 5: Solve for x
   x = 116,890,792.34/11,898.54
6. Step 6: Final answer
   x = 9,823.96