Finding the Fourth Proportional to 78,570.07, 117,783.59 and 28,638.77

Step by Step Solution

1. Step 1: Write the proportion equation
   78,570.07 : 117,783.59 = 28,638.77 : x
2. Step 2: Convert to fraction form
   78,570.07/117,783.59 = 28,638.77/x
3. Step 3: Cross multiply
   78,570.07x = 117,783.59 × 28,638.77
4. Step 4: Simplify right side
   78,570.07x = 3,373,176,411.67
5. Step 5: Solve for x
   x = 3,373,176,411.67/78,570.07
6. Step 6: Final answer
   x = 42,932.08