Finding the Fourth Proportional to 83,670.78, 115,465.42 and 50,136.78

Step by Step Solution

1. Step 1: Write the proportion equation
   83,670.78 : 115,465.42 = 50,136.78 : x
2. Step 2: Convert to fraction form
   83,670.78/115,465.42 = 50,136.78/x
3. Step 3: Cross multiply
   83,670.78x = 115,465.42 × 50,136.78
4. Step 4: Simplify right side
   83,670.78x = 5,789,064,360.15
5. Step 5: Solve for x
   x = 5,789,064,360.15/83,670.78
6. Step 6: Final answer
   x = 69,188.60