Finding the Fourth Proportional to 40,783.16, 61,152.72 and 12,691.04

Step by Step Solution

1. Step 1: Write the proportion equation
   40,783.16 : 61,152.72 = 12,691.04 : x
2. Step 2: Convert to fraction form
   40,783.16/61,152.72 = 12,691.04/x
3. Step 3: Cross multiply
   40,783.16x = 61,152.72 × 12,691.04
4. Step 4: Simplify right side
   40,783.16x = 776,091,615.63
5. Step 5: Solve for x
   x = 776,091,615.63/40,783.16
6. Step 6: Final answer
   x = 19,029.71