Finding the Fourth Proportional to 1,009,979.60, 1,515,499.32 and 379,328.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009,979.60 : 1,515,499.32 = 379,328.72 : x
2. Step 2: Convert to fraction form
   1,009,979.60/1,515,499.32 = 379,328.72/x
3. Step 3: Cross multiply
   1,009,979.60x = 1,515,499.32 × 379,328.72
4. Step 4: Simplify right side
   1,009,979.60x = 574,872,417,216.47
5. Step 5: Solve for x
   x = 574,872,417,216.47/1,009,979.60
6. Step 6: Final answer
   x = 569,192.11