Finding the Fourth Proportional to 142,307.40, 213,471.90 and 42,459.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,307.40 : 213,471.90 = 42,459.78 : x
2. Step 2: Convert to fraction form
   142,307.40/213,471.90 = 42,459.78/x
3. Step 3: Cross multiply
   142,307.40x = 213,471.90 × 42,459.78
4. Step 4: Simplify right side
   142,307.40x = 9,063,969,910.18
5. Step 5: Solve for x
   x = 9,063,969,910.18/142,307.40
6. Step 6: Final answer
   x = 63,692.89