Finding the Fourth Proportional to 64,870.40, 89,521.80 and 38,028.80

Step by Step Solution

1. Step 1: Write the proportion equation
   64,870.40 : 89,521.80 = 38,028.80 : x
2. Step 2: Convert to fraction form
   64,870.40/89,521.80 = 38,028.80/x
3. Step 3: Cross multiply
   64,870.40x = 89,521.80 × 38,028.80
4. Step 4: Simplify right side
   64,870.40x = 3,404,406,627.84
5. Step 5: Solve for x
   x = 3,404,406,627.84/64,870.40
6. Step 6: Final answer
   x = 52,480.12