Finding the Fourth Proportional to 1,376,978.60, 2,065,469.52 and 430,354.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376,978.60 : 2,065,469.52 = 430,354.28 : x
2. Step 2: Convert to fraction form
   1,376,978.60/2,065,469.52 = 430,354.28/x
3. Step 3: Cross multiply
   1,376,978.60x = 2,065,469.52 × 430,354.28
4. Step 4: Simplify right side
   1,376,978.60x = 888,883,648,141.55
5. Step 5: Solve for x
   x = 888,883,648,141.55/1,376,978.60
6. Step 6: Final answer
   x = 645,531.93