Finding the Fourth Proportional to 37,810.86, 56,718.90 and 12,840.72

Step by Step Solution

1. Step 1: Write the proportion equation
   37,810.86 : 56,718.90 = 12,840.72 : x
2. Step 2: Convert to fraction form
   37,810.86/56,718.90 = 12,840.72/x
3. Step 3: Cross multiply
   37,810.86x = 56,718.90 × 12,840.72
4. Step 4: Simplify right side
   37,810.86x = 728,311,513.61
5. Step 5: Solve for x
   x = 728,311,513.61/37,810.86
6. Step 6: Final answer
   x = 19,261.97