Finding the Fourth Proportional to 37,890.78, 56,840.42 and 30,930.05

Step by Step Solution

1. Step 1: Write the proportion equation
   37,890.78 : 56,840.42 = 30,930.05 : x
2. Step 2: Convert to fraction form
   37,890.78/56,840.42 = 30,930.05/x
3. Step 3: Cross multiply
   37,890.78x = 56,840.42 × 30,930.05
4. Step 4: Simplify right side
   37,890.78x = 1,758,076,593.77
5. Step 5: Solve for x
   x = 1,758,076,593.77/37,890.78
6. Step 6: Final answer
   x = 46,398.53