Finding the Fourth Proportional to 129,300,601.20, 194,045,380.20 and 91,036,849.20

Step by Step Solution

1. Step 1: Write the proportion equation
   129,300,601.20 : 194,045,380.20 = 91,036,849.20 : x
2. Step 2: Convert to fraction form
   129,300,601.20/194,045,380.20 = 91,036,849.20/x
3. Step 3: Cross multiply
   129,300,601.20x = 194,045,380.20 × 91,036,849.20
4. Step 4: Simplify right side
   129,300,601.20x = 17,665,280,015,224,066
5. Step 5: Solve for x
   x = 17,665,280,015,224,066/129,300,601.20
6. Step 6: Final answer
   x = 136,621,793.33