Finding the Fourth Proportional to 260,075.34, 390,225.69 and 91,715.96

Step by Step Solution

1. Step 1: Write the proportion equation
   260,075.34 : 390,225.69 = 91,715.96 : x
2. Step 2: Convert to fraction form
   260,075.34/390,225.69 = 91,715.96/x
3. Step 3: Cross multiply
   260,075.34x = 390,225.69 × 91,715.96
4. Step 4: Simplify right side
   260,075.34x = 35,789,921,823.88
5. Step 5: Solve for x
   x = 35,789,921,823.88/260,075.34
6. Step 6: Final answer
   x = 137,613.67