Finding the Fourth Proportional to 686,725.71, 947,779.56 and 380,870.10

Step by Step Solution

1. Step 1: Write the proportion equation
   686,725.71 : 947,779.56 = 380,870.10 : x
2. Step 2: Convert to fraction form
   686,725.71/947,779.56 = 380,870.10/x
3. Step 3: Cross multiply
   686,725.71x = 947,779.56 × 380,870.10
4. Step 4: Simplify right side
   686,725.71x = 360,980,895,795.16
5. Step 5: Solve for x
   x = 360,980,895,795.16/686,725.71
6. Step 6: Final answer
   x = 525,655.13