Finding the Fourth Proportional to 53,294.72, 79,918.86 and 28,328.78

Step by Step Solution

1. Step 1: Write the proportion equation
   53,294.72 : 79,918.86 = 28,328.78 : x
2. Step 2: Convert to fraction form
   53,294.72/79,918.86 = 28,328.78/x
3. Step 3: Cross multiply
   53,294.72x = 79,918.86 × 28,328.78
4. Step 4: Simplify right side
   53,294.72x = 2,264,003,802.79
5. Step 5: Solve for x
   x = 2,264,003,802.79/53,294.72
6. Step 6: Final answer
   x = 42,480.83