Finding the Fourth Proportional to 78,670.63, 117,976.74 and 42,639.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78,670.63 : 117,976.74 = 42,639.94 : x
2. Step 2: Convert to fraction form
   78,670.63/117,976.74 = 42,639.94/x
3. Step 3: Cross multiply
   78,670.63x = 117,976.74 × 42,639.94
4. Step 4: Simplify right side
   78,670.63x = 5,030,521,115.00
5. Step 5: Solve for x
   x = 5,030,521,115.00/78,670.63
6. Step 6: Final answer
   x = 63,944.08