Finding the Fourth Proportional to 1,111,097.79, 1,666,780.16 and 391,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111,097.79 : 1,666,780.16 = 391,290.72 : x
2. Step 2: Convert to fraction form
   1,111,097.79/1,666,780.16 = 391,290.72/x
3. Step 3: Cross multiply
   1,111,097.79x = 1,666,780.16 × 391,290.72
4. Step 4: Simplify right side
   1,111,097.79x = 652,195,608,888.12
5. Step 5: Solve for x
   x = 652,195,608,888.12/1,111,097.79
6. Step 6: Final answer
   x = 586,983.09