Finding the Fourth Proportional to 877,978.82, 1,316,958.63 and 213,130.82

Step by Step Solution

1. Step 1: Write the proportion equation
   877,978.82 : 1,316,958.63 = 213,130.82 : x
2. Step 2: Convert to fraction form
   877,978.82/1,316,958.63 = 213,130.82/x
3. Step 3: Cross multiply
   877,978.82x = 1,316,958.63 × 213,130.82
4. Step 4: Simplify right side
   877,978.82x = 280,684,472,717.98
5. Step 5: Solve for x
   x = 280,684,472,717.98/877,978.82
6. Step 6: Final answer
   x = 319,693.90