Finding the Fourth Proportional to 1,540,779.50, 2,309,916.59 and 642,890.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540,779.50 : 2,309,916.59 = 642,890.05 : x
2. Step 2: Convert to fraction form
   1,540,779.50/2,309,916.59 = 642,890.05/x
3. Step 3: Cross multiply
   1,540,779.50x = 2,309,916.59 × 642,890.05
4. Step 4: Simplify right side
   1,540,779.50x = 1,485,022,385,462.53
5. Step 5: Solve for x
   x = 1,485,022,385,462.53/1,540,779.50
6. Step 6: Final answer
   x = 963,812.40