Finding the Fourth Proportional to 78,215,856.56, 117,323,318.24 and 42,540,812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,215,856.56 : 117,323,318.24 = 42,540,812.72 : x
2. Step 2: Convert to fraction form
   78,215,856.56/117,323,318.24 = 42,540,812.72/x
3. Step 3: Cross multiply
   78,215,856.56x = 117,323,318.24 × 42,540,812.72
4. Step 4: Simplify right side
   78,215,856.56x = 4,991,029,308,936,800
5. Step 5: Solve for x
   x = 4,991,029,308,936,800/78,215,856.56
6. Step 6: Final answer
   x = 63,810,965.30