Finding the Fourth Proportional to 921,762.72, 1,382,886 and 290,697.12

Step by Step Solution

1. Step 1: Write the proportion equation
   921,762.72 : 1,382,886 = 290,697.12 : x
2. Step 2: Convert to fraction form
   921,762.72/1,382,886 = 290,697.12/x
3. Step 3: Cross multiply
   921,762.72x = 1,382,886 × 290,697.12
4. Step 4: Simplify right side
   921,762.72x = 402,000,977,488.32
5. Step 5: Solve for x
   x = 402,000,977,488.32/921,762.72
6. Step 6: Final answer
   x = 436,121.97