Finding the Fourth Proportional to 128,017,850.87, 192,018,804.69 and 78,843,061.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128,017,850.87 : 192,018,804.69 = 78,843,061.56 : x
2. Step 2: Convert to fraction form
   128,017,850.87/192,018,804.69 = 78,843,061.56/x
3. Step 3: Cross multiply
   128,017,850.87x = 192,018,804.69 × 78,843,061.56
4. Step 4: Simplify right side
   128,017,850.87x = 15,139,350,437,496,978
5. Step 5: Solve for x
   x = 15,139,350,437,496,978/128,017,850.87
6. Step 6: Final answer
   x = 118,259,682.81