Finding the Fourth Proportional to 52,406, 72,319.20 and 28,533.12

Step by Step Solution

1. Step 1: Write the proportion equation
   52,406 : 72,319.20 = 28,533.12 : x
2. Step 2: Convert to fraction form
   52,406/72,319.20 = 28,533.12/x
3. Step 3: Cross multiply
   52,406x = 72,319.20 × 28,533.12
4. Step 4: Simplify right side
   52,406x = 2,063,492,411.90
5. Step 5: Solve for x
   x = 2,063,492,411.90/52,406
6. Step 6: Final answer
   x = 39,375.12