Finding the Fourth Proportional to 549,978.03, 824,970.69 and 213,056.10

Step by Step Solution

1. Step 1: Write the proportion equation
   549,978.03 : 824,970.69 = 213,056.10 : x
2. Step 2: Convert to fraction form
   549,978.03/824,970.69 = 213,056.10/x
3. Step 3: Cross multiply
   549,978.03x = 824,970.69 × 213,056.10
4. Step 4: Simplify right side
   549,978.03x = 175,765,037,825.71
5. Step 5: Solve for x
   x = 175,765,037,825.71/549,978.03
6. Step 6: Final answer
   x = 319,585.56