Finding the Fourth Proportional to 783,870.48, 1,175,679.76 and 215,118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   783,870.48 : 1,175,679.76 = 215,118.72 : x
2. Step 2: Convert to fraction form
   783,870.48/1,175,679.76 = 215,118.72/x
3. Step 3: Cross multiply
   783,870.48x = 1,175,679.76 × 215,118.72
4. Step 4: Simplify right side
   783,870.48x = 252,910,725,101.11
5. Step 5: Solve for x
   x = 252,910,725,101.11/783,870.48
6. Step 6: Final answer
   x = 322,643.51