Finding the Fourth Proportional to 52,188.40, 72,020.28 and 28,315.12

Step by Step Solution

1. Step 1: Write the proportion equation
   52,188.40 : 72,020.28 = 28,315.12 : x
2. Step 2: Convert to fraction form
   52,188.40/72,020.28 = 28,315.12/x
3. Step 3: Cross multiply
   52,188.40x = 72,020.28 × 28,315.12
4. Step 4: Simplify right side
   52,188.40x = 2,039,262,870.63
5. Step 5: Solve for x
   x = 2,039,262,870.63/52,188.40
6. Step 6: Final answer
   x = 39,075.02