Finding the Fourth Proportional to 372,112.56, 513,499.68 and 210,978.45

Step by Step Solution

1. Step 1: Write the proportion equation
   372,112.56 : 513,499.68 = 210,978.45 : x
2. Step 2: Convert to fraction form
   372,112.56/513,499.68 = 210,978.45/x
3. Step 3: Cross multiply
   372,112.56x = 513,499.68 × 210,978.45
4. Step 4: Simplify right side
   372,112.56x = 108,337,366,561.90
5. Step 5: Solve for x
   x = 108,337,366,561.90/372,112.56
6. Step 6: Final answer
   x = 291,141.39