Finding the Fourth Proportional to 260,106.15, 390,166.15 and 91,588.15

Step by Step Solution

1. Step 1: Write the proportion equation
   260,106.15 : 390,166.15 = 91,588.15 : x
2. Step 2: Convert to fraction form
   260,106.15/390,166.15 = 91,588.15/x
3. Step 3: Cross multiply
   260,106.15x = 390,166.15 × 91,588.15
4. Step 4: Simplify right side
   260,106.15x = 35,734,596,301.59
5. Step 5: Solve for x
   x = 35,734,596,301.59/260,106.15
6. Step 6: Final answer
   x = 137,384.66