Finding the Fourth Proportional to 76,445.94, 105,491.79 and 42,456.60

Step by Step Solution

1. Step 1: Write the proportion equation
   76,445.94 : 105,491.79 = 42,456.60 : x
2. Step 2: Convert to fraction form
   76,445.94/105,491.79 = 42,456.60/x
3. Step 3: Cross multiply
   76,445.94x = 105,491.79 × 42,456.60
4. Step 4: Simplify right side
   76,445.94x = 4,478,822,731.31
5. Step 5: Solve for x
   x = 4,478,822,731.31/76,445.94
6. Step 6: Final answer
   x = 58,588.10