Finding the Fourth Proportional to 76,472.10, 105,488.73 and 48,128.58

Step by Step Solution

1. Step 1: Write the proportion equation
   76,472.10 : 105,488.73 = 48,128.58 : x
2. Step 2: Convert to fraction form
   76,472.10/105,488.73 = 48,128.58/x
3. Step 3: Cross multiply
   76,472.10x = 105,488.73 × 48,128.58
4. Step 4: Simplify right side
   76,472.10x = 5,077,022,780.90
5. Step 5: Solve for x
   x = 5,077,022,780.90/76,472.10
6. Step 6: Final answer
   x = 66,390.52