Finding the Fourth Proportional to 77,997.92, 107,636.80 and 42,188

Step by Step Solution

1. Step 1: Write the proportion equation
   77,997.92 : 107,636.80 = 42,188 : x
2. Step 2: Convert to fraction form
   77,997.92/107,636.80 = 42,188/x
3. Step 3: Cross multiply
   77,997.92x = 107,636.80 × 42,188
4. Step 4: Simplify right side
   77,997.92x = 4,540,981,318.40
5. Step 5: Solve for x
   x = 4,540,981,318.40/77,997.92
6. Step 6: Final answer
   x = 58,219.26