Finding the Fourth Proportional to 11,981.51, 17,980.01 and 5,407.34

Step by Step Solution

1. Step 1: Write the proportion equation
   11,981.51 : 17,980.01 = 5,407.34 : x
2. Step 2: Convert to fraction form
   11,981.51/17,980.01 = 5,407.34/x
3. Step 3: Cross multiply
   11,981.51x = 17,980.01 × 5,407.34
4. Step 4: Simplify right side
   11,981.51x = 97,223,910.34
5. Step 5: Solve for x
   x = 97,223,910.34/11,981.51
6. Step 6: Final answer
   x = 8,114.50