Finding the Fourth Proportional to 1,290,667.80, 1,781,164.84 and 709,915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,667.80 : 1,781,164.84 = 709,915.50 : x
2. Step 2: Convert to fraction form
   1,290,667.80/1,781,164.84 = 709,915.50/x
3. Step 3: Cross multiply
   1,290,667.80x = 1,781,164.84 × 709,915.50
4. Step 4: Simplify right side
   1,290,667.80x = 1,264,476,527,971.02
5. Step 5: Solve for x
   x = 1,264,476,527,971.02/1,290,667.80
6. Step 6: Final answer
   x = 979,707.19