Finding the Fourth Proportional to 3,946,780.50, 5,921,106.75 and 1,287,388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,946,780.50 : 5,921,106.75 = 1,287,388.50 : x
2. Step 2: Convert to fraction form
   3,946,780.50/5,921,106.75 = 1,287,388.50/x
3. Step 3: Cross multiply
   3,946,780.50x = 5,921,106.75 × 1,287,388.50
4. Step 4: Simplify right side
   3,946,780.50x = 7,622,764,737,222.38
5. Step 5: Solve for x
   x = 7,622,764,737,222.38/3,946,780.50
6. Step 6: Final answer
   x = 1,931,388.06