Finding the Fourth Proportional to 12,900.11, 17,802.35 and 7,236.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.11 : 17,802.35 = 7,236.12 : x
2. Step 2: Convert to fraction form
   12,900.11/17,802.35 = 7,236.12/x
3. Step 3: Cross multiply
   12,900.11x = 17,802.35 × 7,236.12
4. Step 4: Simplify right side
   12,900.11x = 128,819,851.87
5. Step 5: Solve for x
   x = 128,819,851.87/12,900.11
6. Step 6: Final answer
   x = 9,985.95