Finding the Fourth Proportional to 250,485.30, 345,667.68 and 137,307.78

Step by Step Solution

1. Step 1: Write the proportion equation
   250,485.30 : 345,667.68 = 137,307.78 : x
2. Step 2: Convert to fraction form
   250,485.30/345,667.68 = 137,307.78/x
3. Step 3: Cross multiply
   250,485.30x = 345,667.68 × 137,307.78
4. Step 4: Simplify right side
   250,485.30x = 47,462,861,758.55
5. Step 5: Solve for x
   x = 47,462,861,758.55/250,485.30
6. Step 6: Final answer
   x = 189,483.62