Finding the Fourth Proportional to 42,776.98, 64,181.90 and 30,138.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,776.98 : 64,181.90 = 30,138.88 : x
2. Step 2: Convert to fraction form
   42,776.98/64,181.90 = 30,138.88/x
3. Step 3: Cross multiply
   42,776.98x = 64,181.90 × 30,138.88
4. Step 4: Simplify right side
   42,776.98x = 1,934,370,582.27
5. Step 5: Solve for x
   x = 1,934,370,582.27/42,776.98
6. Step 6: Final answer
   x = 45,219.90