Finding the Fourth Proportional to 78,390.42, 117,505.08 and 30,986.25

Step by Step Solution

1. Step 1: Write the proportion equation
   78,390.42 : 117,505.08 = 30,986.25 : x
2. Step 2: Convert to fraction form
   78,390.42/117,505.08 = 30,986.25/x
3. Step 3: Cross multiply
   78,390.42x = 117,505.08 × 30,986.25
4. Step 4: Simplify right side
   78,390.42x = 3,641,041,785.15
5. Step 5: Solve for x
   x = 3,641,041,785.15/78,390.42
6. Step 6: Final answer
   x = 46,447.54