Finding the Fourth Proportional to 1,312,128.81, 1,968,359.94 and 513,307.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312,128.81 : 1,968,359.94 = 513,307.89 : x
2. Step 2: Convert to fraction form
   1,312,128.81/1,968,359.94 = 513,307.89/x
3. Step 3: Cross multiply
   1,312,128.81x = 1,968,359.94 × 513,307.89
4. Step 4: Simplify right side
   1,312,128.81x = 1,010,374,687,561.93
5. Step 5: Solve for x
   x = 1,010,374,687,561.93/1,312,128.81
6. Step 6: Final answer
   x = 770,027.06