Finding the Fourth Proportional to 85,954,728, 128,851,041.78 and 42,783,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,954,728 : 128,851,041.78 = 42,783,118.50 : x
2. Step 2: Convert to fraction form
   85,954,728/128,851,041.78 = 42,783,118.50/x
3. Step 3: Cross multiply
   85,954,728x = 128,851,041.78 × 42,783,118.50
4. Step 4: Simplify right side
   85,954,728x = 5,512,649,389,322,191
5. Step 5: Solve for x
   x = 5,512,649,389,322,191/85,954,728
6. Step 6: Final answer
   x = 64,134,335.80