Finding the Fourth Proportional to 1,680,215.40, 2,318,019.72 and 972,511.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680,215.40 : 2,318,019.72 = 972,511.48 : x
2. Step 2: Convert to fraction form
   1,680,215.40/2,318,019.72 = 972,511.48/x
3. Step 3: Cross multiply
   1,680,215.40x = 2,318,019.72 × 972,511.48
4. Step 4: Simplify right side
   1,680,215.40x = 2,254,300,788,566.39
5. Step 5: Solve for x
   x = 2,254,300,788,566.39/1,680,215.40
6. Step 6: Final answer
   x = 1,341,673.69