Finding the Fourth Proportional to 37,772.10, 56,663.55 and 12,813.30

Step by Step Solution

1. Step 1: Write the proportion equation
   37,772.10 : 56,663.55 = 12,813.30 : x
2. Step 2: Convert to fraction form
   37,772.10/56,663.55 = 12,813.30/x
3. Step 3: Cross multiply
   37,772.10x = 56,663.55 × 12,813.30
4. Step 4: Simplify right side
   37,772.10x = 726,047,065.22
5. Step 5: Solve for x
   x = 726,047,065.22/37,772.10
6. Step 6: Final answer
   x = 19,221.78