Finding the Fourth Proportional to 1,527,387.89, 2,291,080.77 and 390,109.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,527,387.89 : 2,291,080.77 = 390,109.31 : x
2. Step 2: Convert to fraction form
   1,527,387.89/2,291,080.77 = 390,109.31/x
3. Step 3: Cross multiply
   1,527,387.89x = 2,291,080.77 × 390,109.31
4. Step 4: Simplify right side
   1,527,387.89x = 893,771,949,459.63
5. Step 5: Solve for x
   x = 893,771,949,459.63/1,527,387.89
6. Step 6: Final answer
   x = 585,163.70