Finding the Fourth Proportional to 107,978.40, 161,874.72 and 45,692.64

Step by Step Solution

1. Step 1: Write the proportion equation
   107,978.40 : 161,874.72 = 45,692.64 : x
2. Step 2: Convert to fraction form
   107,978.40/161,874.72 = 45,692.64/x
3. Step 3: Cross multiply
   107,978.40x = 161,874.72 × 45,692.64
4. Step 4: Simplify right side
   107,978.40x = 7,396,483,306.06
5. Step 5: Solve for x
   x = 7,396,483,306.06/107,978.40
6. Step 6: Final answer
   x = 68,499.66