Finding the Fourth Proportional to 260,080.84, 390,233.94 and 91,721.47

Step by Step Solution

1. Step 1: Write the proportion equation
   260,080.84 : 390,233.94 = 91,721.47 : x
2. Step 2: Convert to fraction form
   260,080.84/390,233.94 = 91,721.47/x
3. Step 3: Cross multiply
   260,080.84x = 390,233.94 × 91,721.47
4. Step 4: Simplify right side
   260,080.84x = 35,792,830,620.69
5. Step 5: Solve for x
   x = 35,792,830,620.69/260,080.84
6. Step 6: Final answer
   x = 137,621.94