Finding the Fourth Proportional to 52,456, 72,389.28 and 28,904

Step by Step Solution

1. Step 1: Write the proportion equation
   52,456 : 72,389.28 = 28,904 : x
2. Step 2: Convert to fraction form
   52,456/72,389.28 = 28,904/x
3. Step 3: Cross multiply
   52,456x = 72,389.28 × 28,904
4. Step 4: Simplify right side
   52,456x = 2,092,339,749.12
5. Step 5: Solve for x
   x = 2,092,339,749.12/52,456
6. Step 6: Final answer
   x = 39,887.52