Finding the Fourth Proportional to 64,640, 89,204.28 and 42,284

Step by Step Solution

1. Step 1: Write the proportion equation
   64,640 : 89,204.28 = 42,284 : x
2. Step 2: Convert to fraction form
   64,640/89,204.28 = 42,284/x
3. Step 3: Cross multiply
   64,640x = 89,204.28 × 42,284
4. Step 4: Simplify right side
   64,640x = 3,771,913,775.52
5. Step 5: Solve for x
   x = 3,771,913,775.52/64,640
6. Step 6: Final answer
   x = 58,352.63